forked from Minki/linux
drm/i915/gtt: Use shallow dma pages for scratch
We only use the dma pages for scratch, and so do not need to allocate the extra storage for the shadow page directory. v2: Refrain from reintroducing I915_PDES Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190712075818.20616-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
parent
3e1f0a518d
commit
6eebfe8a10
@ -594,26 +594,17 @@ static void cleanup_page_dma(struct i915_address_space *vm,
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#define kmap_atomic_px(px) kmap_atomic(px_base(px)->page)
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#define fill_px(vm, px, v) fill_page_dma((vm), px_base(px), (v))
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#define fill32_px(vm, px, v) fill_page_dma_32((vm), px_base(px), (v))
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static void fill_page_dma(struct i915_address_space *vm,
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struct i915_page_dma *p,
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const u64 val)
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static void
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fill_page_dma(const struct i915_page_dma *p, const u64 val, unsigned int count)
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{
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u64 * const vaddr = kmap_atomic(p->page);
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memset64(vaddr, val, PAGE_SIZE / sizeof(val));
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kunmap_atomic(vaddr);
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kunmap_atomic(memset64(kmap_atomic(p->page), val, count));
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}
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static void fill_page_dma_32(struct i915_address_space *vm,
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struct i915_page_dma *p,
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const u32 v)
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{
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fill_page_dma(vm, p, (u64)v << 32 | v);
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}
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#define fill_px(px, v) fill_page_dma(px_base(px), (v), PAGE_SIZE / sizeof(u64))
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#define fill32_px(px, v) do { \
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u64 v__ = lower_32_bits(v); \
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fill_px((px), v__ << 32 | v__); \
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} while (0)
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static int
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setup_scratch_page(struct i915_address_space *vm, gfp_t gfp)
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@ -687,6 +678,21 @@ static void cleanup_scratch_page(struct i915_address_space *vm)
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__free_pages(p->page, order);
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}
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static void free_scratch(struct i915_address_space *vm)
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{
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if (!vm->scratch_page.daddr) /* set to 0 on clones */
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return;
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if (vm->scratch_pdp.daddr)
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cleanup_page_dma(vm, &vm->scratch_pdp);
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if (vm->scratch_pd.daddr)
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cleanup_page_dma(vm, &vm->scratch_pd);
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if (vm->scratch_pt.daddr)
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cleanup_page_dma(vm, &vm->scratch_pt);
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cleanup_scratch_page(vm);
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}
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static struct i915_page_table *alloc_pt(struct i915_address_space *vm)
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{
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struct i915_page_table *pt;
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@ -711,18 +717,6 @@ static void free_pt(struct i915_address_space *vm, struct i915_page_table *pt)
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kfree(pt);
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}
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static void gen8_initialize_pt(struct i915_address_space *vm,
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struct i915_page_table *pt)
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{
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fill_px(vm, pt, vm->scratch_pte);
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}
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static void gen6_initialize_pt(struct i915_address_space *vm,
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struct i915_page_table *pt)
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{
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fill32_px(vm, pt, vm->scratch_pte);
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}
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static struct i915_page_directory *__alloc_pd(void)
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{
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struct i915_page_directory *pd;
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@ -765,9 +759,11 @@ static void free_pd(struct i915_address_space *vm,
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kfree(pd);
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}
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#define init_pd(vm, pd, to) { \
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fill_px((vm), (pd), gen8_pde_encode(px_dma(to), I915_CACHE_LLC)); \
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memset_p((pd)->entry, (to), 512); \
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static void init_pd(struct i915_page_directory *pd,
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struct i915_page_dma *scratch)
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{
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fill_px(pd, gen8_pde_encode(scratch->daddr, I915_CACHE_LLC));
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memset_p(pd->entry, scratch, 512);
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}
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static inline void
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@ -869,12 +865,11 @@ static void gen8_ppgtt_clear_pd(struct i915_address_space *vm,
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u32 pde;
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gen8_for_each_pde(pt, pd, start, length, pde) {
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GEM_BUG_ON(pt == vm->scratch_pt);
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GEM_BUG_ON(px_base(pt) == &vm->scratch_pt);
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atomic_inc(&pt->used);
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gen8_ppgtt_clear_pt(vm, pt, start, length);
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if (release_pd_entry(pd, pde, &pt->used,
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px_base(vm->scratch_pt)))
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if (release_pd_entry(pd, pde, &pt->used, &vm->scratch_pt))
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free_pt(vm, pt);
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}
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}
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@ -890,12 +885,11 @@ static void gen8_ppgtt_clear_pdp(struct i915_address_space *vm,
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unsigned int pdpe;
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gen8_for_each_pdpe(pd, pdp, start, length, pdpe) {
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GEM_BUG_ON(pd == vm->scratch_pd);
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GEM_BUG_ON(px_base(pd) == &vm->scratch_pd);
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atomic_inc(&pd->used);
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gen8_ppgtt_clear_pd(vm, pd, start, length);
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if (release_pd_entry(pdp, pdpe, &pd->used,
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px_base(vm->scratch_pd)))
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if (release_pd_entry(pdp, pdpe, &pd->used, &vm->scratch_pd))
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free_pd(vm, pd);
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}
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}
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@ -921,12 +915,11 @@ static void gen8_ppgtt_clear_4lvl(struct i915_address_space *vm,
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GEM_BUG_ON(!i915_vm_is_4lvl(vm));
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gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
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GEM_BUG_ON(pdp == vm->scratch_pdp);
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GEM_BUG_ON(px_base(pdp) == &vm->scratch_pdp);
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atomic_inc(&pdp->used);
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gen8_ppgtt_clear_pdp(vm, pdp, start, length);
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if (release_pd_entry(pml4, pml4e, &pdp->used,
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px_base(vm->scratch_pdp)))
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if (release_pd_entry(pml4, pml4e, &pdp->used, &vm->scratch_pdp))
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free_pd(vm, pdp);
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}
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}
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@ -1181,7 +1174,7 @@ static void gen8_free_page_tables(struct i915_address_space *vm,
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int i;
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for (i = 0; i < I915_PDES; i++) {
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if (pd->entry[i] != vm->scratch_pt)
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if (pd->entry[i] != &vm->scratch_pt)
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free_pt(vm, pd->entry[i]);
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}
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}
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@ -1218,37 +1211,34 @@ static int gen8_init_scratch(struct i915_address_space *vm)
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I915_CACHE_LLC,
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vm->has_read_only);
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vm->scratch_pt = alloc_pt(vm);
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if (IS_ERR(vm->scratch_pt)) {
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ret = PTR_ERR(vm->scratch_pt);
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if (unlikely(setup_page_dma(vm, &vm->scratch_pt))) {
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ret = -ENOMEM;
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goto free_scratch_page;
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}
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fill_px(&vm->scratch_pt, vm->scratch_pte);
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vm->scratch_pd = alloc_pd(vm);
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if (IS_ERR(vm->scratch_pd)) {
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ret = PTR_ERR(vm->scratch_pd);
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if (unlikely(setup_page_dma(vm, &vm->scratch_pd))) {
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ret = -ENOMEM;
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goto free_pt;
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}
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fill_px(&vm->scratch_pd,
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gen8_pde_encode(vm->scratch_pt.daddr, I915_CACHE_LLC));
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if (i915_vm_is_4lvl(vm)) {
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vm->scratch_pdp = alloc_pd(vm);
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if (IS_ERR(vm->scratch_pdp)) {
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ret = PTR_ERR(vm->scratch_pdp);
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if (unlikely(setup_page_dma(vm, &vm->scratch_pdp))) {
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ret = -ENOMEM;
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goto free_pd;
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}
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fill_px(&vm->scratch_pdp,
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gen8_pde_encode(vm->scratch_pd.daddr, I915_CACHE_LLC));
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}
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gen8_initialize_pt(vm, vm->scratch_pt);
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init_pd(vm, vm->scratch_pd, vm->scratch_pt);
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if (i915_vm_is_4lvl(vm))
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init_pd(vm, vm->scratch_pdp, vm->scratch_pd);
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return 0;
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free_pd:
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free_pd(vm, vm->scratch_pd);
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cleanup_page_dma(vm, &vm->scratch_pd);
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free_pt:
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free_pt(vm, vm->scratch_pt);
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cleanup_page_dma(vm, &vm->scratch_pt);
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free_scratch_page:
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cleanup_scratch_page(vm);
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@ -1292,18 +1282,6 @@ static int gen8_ppgtt_notify_vgt(struct i915_ppgtt *ppgtt, bool create)
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return 0;
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}
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static void gen8_free_scratch(struct i915_address_space *vm)
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{
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if (!vm->scratch_page.daddr)
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return;
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if (i915_vm_is_4lvl(vm))
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free_pd(vm, vm->scratch_pdp);
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free_pd(vm, vm->scratch_pd);
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free_pt(vm, vm->scratch_pt);
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cleanup_scratch_page(vm);
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}
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static void gen8_ppgtt_cleanup_3lvl(struct i915_address_space *vm,
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struct i915_page_directory *pdp)
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{
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@ -1311,7 +1289,7 @@ static void gen8_ppgtt_cleanup_3lvl(struct i915_address_space *vm,
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int i;
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for (i = 0; i < pdpes; i++) {
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if (pdp->entry[i] == vm->scratch_pd)
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if (pdp->entry[i] == &vm->scratch_pd)
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continue;
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gen8_free_page_tables(vm, pdp->entry[i]);
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@ -1329,7 +1307,7 @@ static void gen8_ppgtt_cleanup_4lvl(struct i915_ppgtt *ppgtt)
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for (i = 0; i < GEN8_PML4ES_PER_PML4; i++) {
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struct i915_page_directory *pdp = i915_pdp_entry(pml4, i);
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if (pdp == ppgtt->vm.scratch_pdp)
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if (px_base(pdp) == &ppgtt->vm.scratch_pdp)
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continue;
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gen8_ppgtt_cleanup_3lvl(&ppgtt->vm, pdp);
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@ -1351,7 +1329,7 @@ static void gen8_ppgtt_cleanup(struct i915_address_space *vm)
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else
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gen8_ppgtt_cleanup_3lvl(&ppgtt->vm, ppgtt->pd);
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gen8_free_scratch(vm);
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free_scratch(vm);
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}
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static int gen8_ppgtt_alloc_pd(struct i915_address_space *vm,
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@ -1367,7 +1345,7 @@ static int gen8_ppgtt_alloc_pd(struct i915_address_space *vm,
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gen8_for_each_pde(pt, pd, start, length, pde) {
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const int count = gen8_pte_count(start, length);
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if (pt == vm->scratch_pt) {
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if (px_base(pt) == &vm->scratch_pt) {
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spin_unlock(&pd->lock);
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pt = fetch_and_zero(&alloc);
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@ -1379,10 +1357,10 @@ static int gen8_ppgtt_alloc_pd(struct i915_address_space *vm,
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}
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if (count < GEN8_PTES || intel_vgpu_active(vm->i915))
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gen8_initialize_pt(vm, pt);
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fill_px(pt, vm->scratch_pte);
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spin_lock(&pd->lock);
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if (pd->entry[pde] == vm->scratch_pt) {
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if (pd->entry[pde] == &vm->scratch_pt) {
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set_pd_entry(pd, pde, pt);
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} else {
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alloc = pt;
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@ -1414,7 +1392,7 @@ static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
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spin_lock(&pdp->lock);
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gen8_for_each_pdpe(pd, pdp, start, length, pdpe) {
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if (pd == vm->scratch_pd) {
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if (px_base(pd) == &vm->scratch_pd) {
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spin_unlock(&pdp->lock);
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pd = fetch_and_zero(&alloc);
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@ -1425,10 +1403,10 @@ static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
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goto unwind;
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}
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init_pd(vm, pd, vm->scratch_pt);
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init_pd(pd, &vm->scratch_pt);
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spin_lock(&pdp->lock);
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if (pdp->entry[pdpe] == vm->scratch_pd) {
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if (pdp->entry[pdpe] == &vm->scratch_pd) {
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set_pd_entry(pdp, pdpe, pd);
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} else {
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alloc = pd;
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@ -1449,7 +1427,7 @@ static int gen8_ppgtt_alloc_pdp(struct i915_address_space *vm,
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goto out;
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unwind_pd:
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if (release_pd_entry(pdp, pdpe, &pd->used, px_base(vm->scratch_pd)))
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if (release_pd_entry(pdp, pdpe, &pd->used, &vm->scratch_pd))
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free_pd(vm, pd);
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unwind:
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gen8_ppgtt_clear_pdp(vm, pdp, from, start - from);
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@ -1478,7 +1456,7 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
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spin_lock(&pml4->lock);
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gen8_for_each_pml4e(pdp, pml4, start, length, pml4e) {
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if (pdp == vm->scratch_pdp) {
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if (px_base(pdp) == &vm->scratch_pdp) {
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spin_unlock(&pml4->lock);
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pdp = fetch_and_zero(&alloc);
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@ -1489,10 +1467,10 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
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goto unwind;
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}
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init_pd(vm, pdp, vm->scratch_pd);
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init_pd(pdp, &vm->scratch_pd);
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spin_lock(&pml4->lock);
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if (pml4->entry[pml4e] == vm->scratch_pdp) {
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if (pml4->entry[pml4e] == &vm->scratch_pdp) {
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set_pd_entry(pml4, pml4e, pdp);
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} else {
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alloc = pdp;
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@ -1513,7 +1491,7 @@ static int gen8_ppgtt_alloc_4lvl(struct i915_address_space *vm,
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goto out;
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unwind_pdp:
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if (release_pd_entry(pml4, pml4e, &pdp->used, px_base(vm->scratch_pdp)))
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if (release_pd_entry(pml4, pml4e, &pdp->used, &vm->scratch_pdp))
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free_pd(vm, pdp);
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unwind:
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gen8_ppgtt_clear_4lvl(vm, from, start - from);
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@ -1537,7 +1515,7 @@ static int gen8_preallocate_top_level_pdp(struct i915_ppgtt *ppgtt)
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if (IS_ERR(pd))
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goto unwind;
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init_pd(vm, pd, vm->scratch_pt);
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init_pd(pd, &vm->scratch_pt);
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set_pd_entry(pdp, pdpe, pd);
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}
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@ -1568,10 +1546,10 @@ static void ppgtt_init(struct i915_ppgtt *ppgtt, struct intel_gt *gt)
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static void init_pd_n(struct i915_address_space *vm,
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struct i915_page_directory *pd,
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struct i915_page_directory *to,
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struct i915_page_dma *to,
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const unsigned int entries)
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{
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const u64 daddr = gen8_pde_encode(px_dma(to), I915_CACHE_LLC);
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const u64 daddr = gen8_pde_encode(to->daddr, I915_CACHE_LLC);
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u64 * const vaddr = kmap_atomic(pd->base.page);
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memset64(vaddr, daddr, entries);
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@ -1588,7 +1566,7 @@ gen8_alloc_top_pd(struct i915_address_space *vm)
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if (i915_vm_is_4lvl(vm)) {
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pd = alloc_pd(vm);
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if (!IS_ERR(pd))
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init_pd(vm, pd, vm->scratch_pdp);
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init_pd(pd, &vm->scratch_pdp);
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return pd;
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}
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@ -1605,7 +1583,7 @@ gen8_alloc_top_pd(struct i915_address_space *vm)
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return ERR_PTR(-ENOMEM);
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}
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init_pd_n(vm, pd, vm->scratch_pd, GEN8_3LVL_PDPES);
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init_pd_n(vm, pd, &vm->scratch_pd, GEN8_3LVL_PDPES);
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return pd;
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}
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@ -1678,7 +1656,7 @@ static struct i915_ppgtt *gen8_ppgtt_create(struct drm_i915_private *i915)
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err_free_pd:
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free_pd(&ppgtt->vm, ppgtt->pd);
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err_free_scratch:
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gen8_free_scratch(&ppgtt->vm);
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free_scratch(&ppgtt->vm);
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err_free:
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kfree(ppgtt);
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return ERR_PTR(err);
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@ -1763,7 +1741,7 @@ static void gen6_ppgtt_clear_range(struct i915_address_space *vm,
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const unsigned int count = min(num_entries, GEN6_PTES - pte);
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gen6_pte_t *vaddr;
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GEM_BUG_ON(pt == vm->scratch_pt);
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GEM_BUG_ON(px_base(pt) == &vm->scratch_pt);
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num_entries -= count;
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@ -1800,7 +1778,7 @@ static void gen6_ppgtt_insert_entries(struct i915_address_space *vm,
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struct sgt_dma iter = sgt_dma(vma);
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gen6_pte_t *vaddr;
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|
||||
GEM_BUG_ON(i915_pt_entry(pd, act_pt) == vm->scratch_pt);
|
||||
GEM_BUG_ON(pd->entry[act_pt] == &vm->scratch_pt);
|
||||
|
||||
vaddr = kmap_atomic_px(i915_pt_entry(pd, act_pt));
|
||||
do {
|
||||
@ -1845,7 +1823,7 @@ static int gen6_alloc_va_range(struct i915_address_space *vm,
|
||||
gen6_for_each_pde(pt, pd, start, length, pde) {
|
||||
const unsigned int count = gen6_pte_count(start, length);
|
||||
|
||||
if (pt == vm->scratch_pt) {
|
||||
if (px_base(pt) == &vm->scratch_pt) {
|
||||
spin_unlock(&pd->lock);
|
||||
|
||||
pt = fetch_and_zero(&alloc);
|
||||
@ -1856,10 +1834,10 @@ static int gen6_alloc_va_range(struct i915_address_space *vm,
|
||||
goto unwind_out;
|
||||
}
|
||||
|
||||
gen6_initialize_pt(vm, pt);
|
||||
fill32_px(pt, vm->scratch_pte);
|
||||
|
||||
spin_lock(&pd->lock);
|
||||
if (pd->entry[pde] == vm->scratch_pt) {
|
||||
if (pd->entry[pde] == &vm->scratch_pt) {
|
||||
pd->entry[pde] = pt;
|
||||
if (i915_vma_is_bound(ppgtt->vma,
|
||||
I915_VMA_GLOBAL_BIND)) {
|
||||
@ -1908,26 +1886,18 @@ static int gen6_ppgtt_init_scratch(struct gen6_ppgtt *ppgtt)
|
||||
I915_CACHE_NONE,
|
||||
PTE_READ_ONLY);
|
||||
|
||||
vm->scratch_pt = alloc_pt(vm);
|
||||
if (IS_ERR(vm->scratch_pt)) {
|
||||
if (unlikely(setup_page_dma(vm, &vm->scratch_pt))) {
|
||||
cleanup_scratch_page(vm);
|
||||
return PTR_ERR(vm->scratch_pt);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
gen6_initialize_pt(vm, vm->scratch_pt);
|
||||
fill32_px(&vm->scratch_pt, vm->scratch_pte);
|
||||
|
||||
gen6_for_all_pdes(unused, pd, pde)
|
||||
pd->entry[pde] = vm->scratch_pt;
|
||||
pd->entry[pde] = &vm->scratch_pt;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void gen6_ppgtt_free_scratch(struct i915_address_space *vm)
|
||||
{
|
||||
free_pt(vm, vm->scratch_pt);
|
||||
cleanup_scratch_page(vm);
|
||||
}
|
||||
|
||||
static void gen6_ppgtt_free_pd(struct gen6_ppgtt *ppgtt)
|
||||
{
|
||||
struct i915_page_directory * const pd = ppgtt->base.pd;
|
||||
@ -1935,7 +1905,7 @@ static void gen6_ppgtt_free_pd(struct gen6_ppgtt *ppgtt)
|
||||
u32 pde;
|
||||
|
||||
gen6_for_all_pdes(pt, pd, pde)
|
||||
if (pt != ppgtt->base.vm.scratch_pt)
|
||||
if (px_base(pt) != &ppgtt->base.vm.scratch_pt)
|
||||
free_pt(&ppgtt->base.vm, pt);
|
||||
}
|
||||
|
||||
@ -1950,7 +1920,7 @@ static void gen6_ppgtt_cleanup(struct i915_address_space *vm)
|
||||
mutex_unlock(&i915->drm.struct_mutex);
|
||||
|
||||
gen6_ppgtt_free_pd(ppgtt);
|
||||
gen6_ppgtt_free_scratch(vm);
|
||||
free_scratch(vm);
|
||||
kfree(ppgtt->base.pd);
|
||||
}
|
||||
|
||||
@ -1993,7 +1963,7 @@ static void pd_vma_unbind(struct i915_vma *vma)
|
||||
{
|
||||
struct gen6_ppgtt *ppgtt = vma->private;
|
||||
struct i915_page_directory * const pd = ppgtt->base.pd;
|
||||
struct i915_page_table * const scratch_pt = ppgtt->base.vm.scratch_pt;
|
||||
struct i915_page_dma * const scratch = &ppgtt->base.vm.scratch_pt;
|
||||
struct i915_page_table *pt;
|
||||
unsigned int pde;
|
||||
|
||||
@ -2002,11 +1972,11 @@ static void pd_vma_unbind(struct i915_vma *vma)
|
||||
|
||||
/* Free all no longer used page tables */
|
||||
gen6_for_all_pdes(pt, ppgtt->base.pd, pde) {
|
||||
if (atomic_read(&pt->used) || pt == scratch_pt)
|
||||
if (px_base(pt) == scratch || atomic_read(&pt->used))
|
||||
continue;
|
||||
|
||||
free_pt(&ppgtt->base.vm, pt);
|
||||
pd->entry[pde] = scratch_pt;
|
||||
pd->entry[pde] = scratch;
|
||||
}
|
||||
|
||||
ppgtt->scan_for_unused_pt = false;
|
||||
@ -2148,7 +2118,7 @@ static struct i915_ppgtt *gen6_ppgtt_create(struct drm_i915_private *i915)
|
||||
return &ppgtt->base;
|
||||
|
||||
err_scratch:
|
||||
gen6_ppgtt_free_scratch(&ppgtt->base.vm);
|
||||
free_scratch(&ppgtt->base.vm);
|
||||
err_pd:
|
||||
kfree(ppgtt->base.pd);
|
||||
err_free:
|
||||
|
||||
@ -240,9 +240,6 @@ struct i915_page_dma {
|
||||
};
|
||||
};
|
||||
|
||||
#define px_base(px) (&(px)->base)
|
||||
#define px_dma(px) (px_base(px)->daddr)
|
||||
|
||||
struct i915_page_table {
|
||||
struct i915_page_dma base;
|
||||
atomic_t used;
|
||||
@ -255,6 +252,20 @@ struct i915_page_directory {
|
||||
void *entry[512];
|
||||
};
|
||||
|
||||
#define __px_choose_expr(x, type, expr, other) \
|
||||
__builtin_choose_expr( \
|
||||
__builtin_types_compatible_p(typeof(x), type) || \
|
||||
__builtin_types_compatible_p(typeof(x), const type), \
|
||||
({ type __x = (type)(x); expr; }), \
|
||||
other)
|
||||
|
||||
#define px_base(px) \
|
||||
__px_choose_expr(px, struct i915_page_dma *, __x, \
|
||||
__px_choose_expr(px, struct i915_page_table *, &__x->base, \
|
||||
__px_choose_expr(px, struct i915_page_directory *, &__x->base, \
|
||||
(void)0)))
|
||||
#define px_dma(px) (px_base(px)->daddr)
|
||||
|
||||
struct i915_vma_ops {
|
||||
/* Map an object into an address space with the given cache flags. */
|
||||
int (*bind_vma)(struct i915_vma *vma,
|
||||
@ -304,9 +315,9 @@ struct i915_address_space {
|
||||
u64 scratch_pte;
|
||||
int scratch_order;
|
||||
struct i915_page_dma scratch_page;
|
||||
struct i915_page_table *scratch_pt;
|
||||
struct i915_page_directory *scratch_pd;
|
||||
struct i915_page_directory *scratch_pdp; /* GEN8+ & 48b PPGTT */
|
||||
struct i915_page_dma scratch_pt;
|
||||
struct i915_page_dma scratch_pd;
|
||||
struct i915_page_dma scratch_pdp; /* GEN8+ & 48b PPGTT */
|
||||
|
||||
/**
|
||||
* List of vma currently bound.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user